Interactions Among Living Things

Classifications of animals: herbivores herbivores – animals that eat only plants carnivores carnivores – animals that eat only meat scavengers scavengers – eat dead animals omnivores omnivores – eat plants and animals

Look at the following a/biotic factors… What do you notice??? What do you notice??? hawk grasshopper bacteria grass sun lizard ALL OF THESE FACTORS INTERACT WITH EACH OTHER IN SOME WAY!!!

How would you connect these to show the interaction?

All organisms need the sun’s energy to function/live.

So, how does the hawk get energy from the sun? energy from the sun? It takes it from the lizard.

Where does the lizard get its energy? its energy? It takes it from the grasshopper.

Where does the grasshopper get its energy? get its energy? It takes it from the grass.

…and the grass gets it energy from… from… THE SUN!!!

How does the bacteria get energy from the sun? energy from the sun? It gets it from dead plants and animals.

What is a Food Chain? -the path energy (from the sun) takes from producer to consumer to decomposer -The sun’s energy is passed from one organism to another.

Do all organisms eat only one type of food? Are all organisms eaten by only one type of animal? NO

A food chain only shows how energy passes from one organism to another. How do you show how all of the organisms interact in a community or an ecosystem?

You must use a FOOD WEB! A FOOD WEB … … shows the relationship between all of … shows the relationship between all of the species in a community. the species in a community. … shows how populations within a … shows how populations within a community must compete for food. community must compete for food. … is a map of overlapping food chains. … is a map of overlapping food chains.

All food webs start with producers. Terrestrial Producers Aquatic Producers grasses trees shrubs seaweed algae They then move to consumers...

The primary consumers are usually herbivores. are usually herbivores. Secondary consumers eat primary consumers. primary consumers. Tertiary consumers eat secondary consumers. secondary consumers.

The relationship between predators and prey is a key part of both food chains and food webs. PREY – animals hunted for food PREDATORS – animals that hunt other animals

Think about this… … if all meat eaters are carnivores, are all meat eaters predators?

There are some animals who eat meat, but do not hunt for it. scavengers These animals are called scavengers. They feed on the remains of dead animals.

Examples of scavengers crabsvultures hyenas crows

If all food webs begin with producers, what do all food webs end with? DECOMPOSERS Decomposers break down dead matter into substances that can be used by producers.

Examples of decomposers worms mushrooms sowbugs bacteria

What do you notice about the arrows in this aquatic food web?